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Write a function that takes an unsigned integer and returns the number of ’1‘ bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11‘ has binary representation 00000000000000000000000000001011, so the function should return 3.

不敢相信我的眼睛了，居然这么简单的题目。

 1 class Solution {
 2 public:
 3     int hammingWeight(uint32_t n) {
 4         int cnt=0;
 5         while(n) {
 6             if(n%2)
 7                 cnt++;
 8             n /= 2;
 9         }
10         return cnt; 
11     }
12 };

AC！

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原文：http://www.cnblogs.com/ittinybird/p/4373110.html